Aqua Medic NR 1000 Mode D'emploi page 12

If a little bit of Hydrogensulfide is entering the aquarium, this is not critical. It is immediately oxydized to
sulphate. The closed version of the Nitratereductor causes no problems with bad smell.
Controlling the Nitratereductor
The Nitratereductor can be controlled by the rate of feeding or the flow rate of water:
If the redox potential exceeds -50 mV or even gets positive, the dosage of food can be increased or the flow
rate decreased. If the redox potential sinks below -300 mV, the feeding can be reduced or the flow rate
increased. If you work with denimar-powder, you should keep the flow rate constant. If the redox potential sinks
below -300 mV, stop feeding. If the redox potential exceeds -50 mV, double the food supply until the value
decreases.
If you work with Deniballs, you should vary the flow rate.
11. Failures
Problems with denitrification are mostly caused by wrong adjustion of the flow and the feeding rate. They can
only be determined by measurements of the nitrite and nitrate concentrations in the filter or by measurement
of the redox potential.
- The pump makes noise: If the pump housing contains air or gas, this causes a strong noise. In this case,
the pump is pumping little or no water and its cooling is insufficient. The pump may overheat and be
destroyed. The plastic elbow at the pump outlet has a small hole where air and gas can escape. If this hole
is blocked, it has to be cleaned with a needle.
- Nitrite in the outlet of the filter: If the outlet of the filter contains high amounts of nitrite, the feeding
rate is too low. Increase the feeding or lower the flow rate. In most of those cases, the redox potential is too
high (more than -50 mV).
- Nitrate in the outlet of the filter: High residual concentrations of nitrate often occur together with high
nitrite values. Caution! Most nitrate tests are disturbed by high nitrite concentrations! In this case, the redox
potential is also too high. Increase feeding rates, decrease the flow rate.
- Hydrogen sulphide in the outlet of the filter: The filter smells like fouling eggs. In most cases, the redox
potential is too low. Reduce the feeding, check the flow rate and increase it if necessary.
12. Warranty conditions
AB Aqua Medic GmbH grants the first-time user a 24-month guarantee from the date of purchase on all material
and manufacturing defects of the device. Incidentally, the consumer has legal rights; these are not limited by
this warranty. This warranty does not cover user serviceable parts, due to normal wear & tear i.e: impellers or
drive wheels etc. The original invoice or receipt is required as proof of purchase. During the warranty period,
we will repair the product for free by installing new or renewed parts. This warranty only covers material and
processing faults that occur when used as intended. It does not apply to damage caused by transport, improper
handling, incorrect installation, negligence, interference or repairs made by unauthorized persons. In case of a
fault with the unit during or after the warranty period, please contact your dealer. All further steps are
clarified between the dealer and AB Aqua Medic. All complaints and returns that are not sent to us
via specialist dealers cannot be processed. AB Aqua Medic is not liable for consequential damages resulting
from the use of any of our products.
AB Aqua Medic GmbH - Gewerbepark 24 - 49143 Bissendorf/Germany
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- Technical changes reserved – 04/2019